ACC Utilities Reference Guide

TTGEN - ZCOM System Table Generator
Memory Image File Overview
Chapter 2 29
Memory Image File Overview
ZCOM System Header
The ZCOM System Header contains fixed information such as the
location and number of all the tables in the ZCOM sub-system, and also
the size of the buffer pool. For more detail, see the data structure
zheader_type in /opt/acc/include/zcom/zcomsys.h.
Node Entries
The Node Entries table contain information about the remote ZCOM
sub-systems that communicate with the local ZCOM sub-system. Each
entry contains statistics and control information for a node and TCP/IP
addressing information for the links to that node. For more detail, see
the data structure znode_type in /opt/acc/include/zcom/zcomsys.h.
ZLU Tables
The ZLU entries consist of information for the physical terminal ZLUs
plus the dynamically assignable ZLUs. The ZLU tables provide
references to various objects that can exist in the ZCOM subsystem,
similar to how file descriptors are used in HP-UX. ZLUs can refer to a
network communication endpoint or device such as an HDLC link or
X.25 virtual circuit (Terminal ZLU), or they can refer to an application
(Program ZLU). Each ZLU entries contains information about its owner,
type, and other operational information.
For more detail, see the data structure zlu_type in
/opt/acc/include/zcom/zcomsys.h.
Logical Terminal Tables
The logical terminal tables contain information such as the terminal type
and location, and its owning ZLU number. A large area of this table is
reserved for use by the application programs. A number of logical
terminals may be linked to a single physical terminal; for example, it
may be used in any instance where a remote concentrator handles a